BACKGROUND OF THE INVENTION
1. Field of the Invention
[0001] This invention relates to a packing film stretching and rewinding machine, particularly
to one able to carry out stretching, lip-folding, swinging and re-winding for a packing
film on a machine table at the same time. The packing film stretching and rewinding
machine is provided with a stretching device for stretching, lengthening and thinning
the packing film, and after stretched, the packing film has opposite edges folded
by a lip-folding device to enhance the strength of the opposite edges of the packing
film. After edge folding, the packing film can be quickly re-wound into small rolls
by means of a swing device and a re-winding device. Thus, when the stretched packing
film is rewound into small rolls, the portion of a reel located at the opposite edges
of the packing film will not be tightened and deformed, and it is needless to stop
operation of the machine in the course of whole operation, able to have the packing
film stretched, lip folded and rewound into small rolls quickly, greatly increasing
output, saving man power and the placing space for the machine table, reducing waste
materials and lowering producing cost.
2. Description of the Prior Art
[0002] Generally, a packing film with a comparatively great thickness to be used for packing
articles is manufactured by a packing film manufacturing machine and the packing film
is usually wound into a large roll. Substantially, a common packing film manufacturing
machine cannot manufacture a very thin packing film; therefore, the packing film manufactured
has to be stretched and thinned by a stretching machine so that it can be used for
packing articles conveniently. After stretched, the packing film is first wound into
a large roll and then this large roll of stretched packing film is manually moved
onto a rewinding machine to be rewound into lots of small rolls of packing film by
means of paper reels. However, after the conventional packing film is stretched, the
stretching machine has to be stopped operating before the stretched packing film is
moved onto a re-winding machine to be rewound. As mentioned above, after each large
roll of packing film is stretched, the stretching machine must be stopped operating
and the large roll of packing film has to be moved onto the rewinding machine, thus
taking lots of time and exertion. Further, a common rewinding machine can rewind only
one roll of packing film at one time, with the action of rewinding complicated and
slow, resulting in limitation in output of stretched and rewound packing film. Furthermore,
after the packing film is stretched by the stretching machine, the opposite edges
of the packing film will become thicker than the rest portion of the packing film;
therefore, when the packing film is orderly rewound into small rolls, the thicker
opposite edges of the packing film will produce a tightening force to the reel of
the packing film and make the reel deformed. In addition, although the opposite edges
of the packing film are thicker than the rest portion of the packing film, when the
packing film is packed on an article and pulled forcefully, the opposite edges of
the packing film are easy to be broken by pulling. Thus, the packing film fails to
be completely packed on the article and the broken part of the packing film has to
be torn off, squandering away the packing film. Moreover, there must be a large space
for placing the stretching machine, the re-winding machine and other related machines
at the same time.
SUMMARY OF THE INVENTION
[0003] The objective of this invention is to offer a packing film stretching and rewinding
machine, able to carry out stretching, lip-folding and rewinding for a packing film
at the same time on a machine table. The packing film can be stretched, lengthened
and thinned by a stretching device, and then the opposite edges of the packing film
are lip-folded by a lip-folding device to increase the strength of the opposite edges
of the packing film. After edged, the packing film can quickly be rewound into small
rolls by means of a swing device and a rewinding device. Thus, when the stretched
packing film is rewound on reels, the reel located at the edges of the packing film
will not be tightened and deformed by the thicker edges of the packing film. By so
designing, in the course of whole operation, it is needless to stop operation of the
machine, and the packing film can quickly be stretched, lip-folded and rewound into
small rolls, able to greatly increase output, save man-power and the placing space
for the machine table, reduce waste materials and lower producing cost.
[0004] The feature of this invention is a machine table 1 provided thereon with a stretching
device 2, a lip-folding device 3, a swing device 4 and a rewinding device 5. The stretching
device 2 is composed of a material-conveying shaft 20, a material press wheel 21 positioned
at one side of the material-conveying shaft 20, plural stretching-rotating wheel 22
different in rotating speed and positioned above the material press wheel 21, plural
guide wheels 23 respectively positioned between every two stretching-rotating wheels
22, plural conveyer guide wheels 24 set at one side of the stretching-rotating wheels
22 and a transmission unit 25 assembled at the outer side of the machine table 1.
The lip-folding device 3 positioned above the stretching device 2 is provided with
two guide wheels 30, 31 having their opposite ends respectively fixed with a lip-folding
plate 32, 33, a conveyer roller 34 positioned at one side of the guide wheel 31, and
a press wheel 35 fixed on the conveyer roller 34. The swing device 4 positioned on
the machine table 1 is provided with an air pressure cylinder 40 secured on the machine
table 1. Two opposite support frames 41 are fixed on the machine table 1, and the
push rod 400 of the air pressure cylinder 40 is inserted out of the machine table
1 and fixed on one of the two support frames 41 by means of a connecting plate 42,
and further plural guide posts 43 are assembled between the two support frames 41.
The rewinding device 5 assembled over the swing device 4 is provided with a feeding
funnel 50 and two opposite rotary disks 51 positioned under the feeding funnel 50
and between the two support frames 41 of the swing device 4. The two opposite rotary
disks 51 are provided with a rotating shaft 52 and respectively fixed thereon with
a plurality of opposite clamping claws 53, and a cutter 54 and a collection frame
57 are assembled under the two rotary disks 51.
BRIEF DESCRIPTION OF DRAWINGS
[0005] This invention will be better understood by referring to the accompanying drawings,
wherein:
Fig. 1 is a cross-sectional view of a packing film stretching and rewinding machine
in the present invention;
Fig. 2 is a side-sectional view of the packing film stretching and rewinding machine
in the present invention;
Fig. 3 is a cross-sectional view of the transmission unit of the packing film stretching
and rewinding machine in the present invention;
Fig. 4 is an upper view of the packing film stretching and rewinding machine in the
present invention;
Fig. 5 is a side-sectional view of a swing device and a rewinding device in the present
invention;
Fig. 6 is another side-sectional view of the swing device and the rewinding device
in the present invention; and
Fig. 7 is a cross-sectional view of the packing film stretching and rewinding machine
in the present invention, showing a cutter cutting off the packing film.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0006] A preferred embodiment of a packing film stretching and rewinding machine in the
present invention, as shown Figs. 1 to 7, includes a machine table 1 provided thereon
with a stretching device 2, a lip-folding device 3, a swing device 4 and a rewinding
device 5.
[0007] The stretching device 2 is provided with a material-conveying rotary shaft 20 assembled
thereon with a roll of packing film (A) to be stretched. A material press wheel 21
is disposed at a location adjacent to one side of the material-conveying rotary shaft
20. A plurality of stretching-rotating wheels 22 different in rotating speed and having
their surfaces respectively cut with patterns are positioned above the material press
wheel 21, and plural guide wheels 23 are respectively set between every two stretching-rotating
wheels 22 and at the topside and the underside of the stretching-rotating wheels 22.
Further a conveyer guide wheel 24 is positioned at one side of the stretching-rotating
wheels 22. A transmission unit 25 is installed at the outer side of the machine table
1, as shown in Figs. 2 and 3. The transmission unit 25 is composed of two transmission
motors 250, 251, plural transmission wheels 252 different in size, plural endless
transmission belts 253 and plural press wheels 254. The transmission belts 253 are
respectively fitted around the transmission wheels 252 of the two transmission motors
250, 251, the stretching-rotating wheels 22, the material press wheel 21 and the transmission
wheel 252 on the conveyer guide wheel 24.
[0008] The lip-folding device 3, as shown in Figs. 1 and 4, is positioned above the stretching
device 2, provided with two guide wheels 30, 31 having their opposite ends respectively
fixed with a lip-folding plate 32, 33, and the guide wheel 31 has one side provided
with a conveyer roller 34 having topside mounted with a press wheel 35.
[0009] The swing device 4, as shown in Figs. 1, 4 and 5, is provided with an air pressure
cylinder 40 secured on the machine table 1. Two opposite support frames 41 are disposed
on the machine table 1, a push rod 400 of the air pressure cylinder 40 is inserted
through the machine table 1 and fixed on one of the two support frames 41 by means
of a connecting plate 42, and further two guide posts 43 are assembled between the
two support frames 41.
[0010] The rewinding device 5, as shown in Figs. 1, 4 and 5, is positioned over the swing
device 4, provided with a feeding funnel 50 fitted therein with lots of reels A1.
Two rotary disks 51 are oppositely positioned beneath the feeding funnel 50 and between
the two support frames 41, provided with a rotary shaft 52 and respectively fixed
thereon with four clamping claws 53 facing each other for clamping and holding reels
A1. A cutter 54 is assembled under the two rotary disks 51, having a support shaft
540 inserted through the outer side of the support frames 41 and having an outer end
secured with a connecting rod 55 connected with an air pressure cylinder 56. A collection
frame 57 is positioned under the two rotary disks 51 for collecting rewound packing
film (A). Thus, the packing film stretching and rewinding machine of this invention
is finished assembling.
[0011] In using, referring to Figs. 1 to 7, firstly, a large roll of packing film (A) to
be stretched is mounted on the material-conveying shaft 20 of the stretching device
2 to be held by the material press wheel 21 at one side of the material-conveying
shaft 20, and then the packing film (A) is pulled to pass along each stretching rotary
wheel 22 and each guide wheel 23. Simultaneously, the stretching-rotating wheels 22
will be respectively actuated by the different-sized transmission wheels 252 of the
transmission unit 25 to rotate at different speeds to let each stretching-rotating
wheel 22 form rotating speed different and produce stretching ratio. Thus, when passing
along each stretching-rotating wheel 22, the packing film (A) will be stretched, lengthened
and thinned. Subsequently, the stretched packing film (A) is conveyed to the guide
wheel 30 of the lip-folding device 3 via the conveyer guide wheel 24, as shown in
Figs. 1 and 4, to have one edge of the packing film (A) guided and bent downward by
the lip-folding plate 32 on the guide wheel 30, and when the packing film (A) is conveyed
to another guide wheel 31, the other edge of the packing film (A) will be bent downward
by the other lip-folding plate 33, letting the opposite two edges of the packing film
(A) bent downward to form a lip edge A2 respectively. Afterward, the packing film
(A) with lip edges A2 is conveyed to the rewinding device 5 via the conveyer roller
34 and during being conveyed, the opposite lip edges A2 of the packing film (A) will
be pressed by the press wheels 35 and stuck to the packing film (A) so as to enhance
the strength of the opposite edges of the packing film (A). Meanwhile, the reels A1
in the feeding funnel 50 of the rewinding device 5 will be actuated to drop to a location
between the two rotary disks 51 to be clamped by the opposite clamping claws 53 and
positioned on the two rotary disks 51, and then the rotary disks 51 are rotated to
move the reel A1 to a location corresponding with one side of the conveyer roller
34 (i.e. a rewinding position) to let the edged packing film (A) guided and conveyed
onto the reel A1, which will be actuated by the conveyer roller 34 to rotate and wind
up the edged packing film (A). In the meantime, the air pressure cylinder 40 of the
swing device 4 will be operated to carry out reciprocating action to extend outward
and contract inward, as shown in Figs. 5 and 6, to drive the two support frames 41
to move to and fro on the two guide posts 43 and actuate the rewinding device 5 to
shift back and forth to let the thicker opposite edges of the packing film (A) wound
on the reel A1 out of alignment. Thus, after the stretched and edged packing film
(A) is rewound on the reel A1, the thicker opposite edges of the packing film (A)
are not arranged in alignment to form greater thickness but distributed over the reel
A1, able to disperse the tightening force of the opposite edges imposed upon the reel
A1 for preventing the reel A1 at the location of the opposite edges of the packing
film (A) from being deformed by tightening. When one reel A1 on the rotary disks 51
is rotated to rewind the packing film (A) up to a size preset, the rotary disks 51
will be turned for 90 degrees, as shown in Fig. 7, to let the packing film (A) pulled
downward, and meanwhile another two opposite clamping claws 53 on the two rotary disks
51, which clamp another reel A1, will be rotated to the rewinding location (at one
side of the conveyer roller 34). When the reel A1 having the packing film (A) rewound
thereon is turned and shifted downward to a location over the collection frame 57,
the air pressure cylinder 56 is operated to actuate the cutter 54 of the rewinding
device 5 to turn and cut off the packing film (A) that is pulled downward and then
the reel A1 rewound thereon with the packing film (A) will be released from the clamping
of the clamping claws 53 and drop onto the collection frame 57 to be gathered. Simultaneously,
another reel A1 on the rotary disks 51 will carry out another rewinding action in
order.
[0012] By so designing, the packing film (A) can be stretched, lip-folded, and re-wound
on the machine table 1 at the same time. Specifically, the packing film (A) can be
stretched by the stretching device 2 to be lengthened and thinned, and after stretched,
the packing film (A) has the opposite edges folded by the lip-folding device 3 to
elevate the strength of the opposite edges of the packing film (A). After edged, the
packing film (A) can quickly be rewound into small rolls by means of the swing device
4 and the rewinding device 5.
[0013] To sum up, this invention has the following advantages.
- 1. When the stretched packing film (A) is rewound on the reel A1, the reel A1 at the
locations of the opposite edges of the packing film (A) will not be deformed by tightening.
- 2. In the course of whole operation, it is needless to stop operating of the machine.
- 3. The integrated operation of stretching, lip-folding and rewinding can greatly increase
output, economize manpower and time, save machine table placing space, reduce waste
materials and lower producing cost.
[0014] While the preferred embodiment of the invention has been described above, it will
be recognized and understood that various modifications may be made therein and the
appended claims are intended to cover all such modifications that may fall within
the spirit and scope of the invention.
1. A packing film stretching and rewinding machine comprising a machine table 1: and
characterized by said machine table 1 assembled thereon with a stretching device 2, a lip-folding
device 3, a swing device 4 and a rewinding device 5, said stretching device 2 provided
with a material-conveying rotary shaft 20, said material-conveying rotary shaft 20
having one side disposed with a material press wheel 21, plural stretching-rotating
wheels 22 with different rotating speeds positioned above said material press wheel
21, plural guide wheels 23 respectively set between every two of said stretching-rotating
wheels 22 and at the topside and the underside of said stretching-rotating wheel 22,
a conveyer guide wheel 24 positioned to one side of said stretching-rotating wheel
22, said machine table 1 having an outer side provided with a transmission unit 25,
said lip-folding device 3 positioned above said stretching device 2, said lip-folding
device 3 disposed with two guide wheels 30, 31, said two guide wheels 30, 31 having
their opposite ends respectively fixed with a lip-folding plate 32, 33, a conveyer
roller 34 located at one side of said guide wheel 31, said conveyer roller 34 having
topside mounted with a press wheel 35, said swing device 4 assembled on said machine
table 1, said swing device 4 having an air pressure cylinder 40 secured on said machine
table 1, said machine table 1 disposed with two opposite support frames 41, said air
pressure cylinder 40 having a push rod 400 inserted through said machine table 1 and
fixed on one of said two support frames 41 by means of a connecting plate 42, plural
guide posts 43 assembled between said two support frames 41, said rewinding device
5 positioned above said swing device 4, said rewinding device 5 provided with a feeding
funnel 50, two opposite rotary disks 51 fixed under said feeding funnel 50 and positioned
between said two support frames 41 of said swing device 4, said two rotary disks 51
provided with a rotating shaft 52 and respectively fixed thereon with plural opposite
clamping claws 53, a cutter 54 and a collection frame 57 respectively assembled under
said two rotary disks 51.
2. The packing film stretching and rewinding machine as claimed in Claim 1, wherein each
said stretching-rotating wheel 22 of said stretching device 2 has an outer surface
provided with cut patterns.
3. The packing film stretching and rewinding machine as claimed in Claim 1, wherein said
transmission unit 25 is composed of two transmission motors 250, 251, plural transmission
wheels 252 different in size, plural endless transmission belts 253 and plural press
wheels 254, said transmission belts 253 respectively fitted around said transmission
wheels 252 of said two transmission motors 250, 251 and said stretch-rotating wheels
22 and around said material press wheel 21 and said transmission wheel 252 on said
conveyer guide wheel 24.
4. The packing film stretching and rewinding machine as claimed in Claim 1, wherein the
support frame 540 of said cutter 54 of said rewinding device 5 is inserted out of
said two support frames 41 of said swing device 4 and has an outer end fixed with
a connecting rod 55 that is connected with an air pressure cylinder 56.